“When we bring the crystal into our electromagnetic field, two things occur. The electromagnetic frequencies carried by the stone will vibrate with related frequencies in our own energy field through the physical law of resonance, creating a third larger vibration field. The nervous system is attuned to these shifts in energy and transmits this information to the brain. Here the frequencies stimulate biochemical shifts that affect the physical body and shift brain function.” (Book of Stones, Simmons & Ahsian 2005, 28)